Ok, looking in the creation kit, anything with college magicka regen enchantments 01 - 05 will actually give magicka regeneration. Of the other robe enchantments, (02-05) only 03 is actually going to disenchant for regeneration. They all have the magical effect of regeneration, but 02, 04, and 05 have the base enchantment of fortify magicka rate, so they would disenchant differently. This covers several different varieties of robes, including your common, skull-front necro robes. If you can find 100% regen necro robes, they should work, as should any of the college base robes.
As Cherry mentioned, the school-specific (destruction and magicka regen) will come as a separate enchantment, but the plain jane novice robes should do the job for you.